A researcher performs an experiment to test a hypothesis that involves the nutrients niacin and retinol. She feeds one group of laboratory rats a daily diet of precisely44.6 units of niacin and 33,100 units of retinol. She uses two types commercial pellet foods. Food A contains 0.19 unit of niacin and 155 units of retinol per gram.Food B contains 0.22 unit of niacin and 70 units of retinol per gram. How many grams of each food does she feed this group of rats each day?food A food B